swank

hello folks. just wondering if anybody knows what rpm's = how fast with a getrag and 3.54's. i'll be getting a tach soon and haven't had a speedo since buying the truck.

swank

oh yeah. does anybody have a 16cm housing they want to get rid of?

racermatt2606

Theres a 16cm housing on Ebay right now. Just type in Holset adn it wil be there. im waiting on it to get near the end before i bid on it.

swank

thanks. i'll check it out.

Alec

The 657 revs/mile is what the factory speedo seems to be set at, based on someone else's post, and my own observations looking at the tach and the speedo. True ground-speed depends on your actual tires.

Hope this helps.

rev/mile axle
657 3.54

,5.53 ,3.02 ,1.6 ,1 ,0.77
mph ,rpms/1st ,rpms/2nd,3 ,4 ,5
5 , 1,071.8 ,585.3 ,310.1 ,193.8 , 149.2
10 , 2,143.6 ,1,170.6 ,620.2 ,387.6 , 298.5
15 , - ,1,756.0 ,930.3 ,581.4 , 447.7
20 , - ,2,341.3 ,1,240.4 ,775.3 , 597.0
25 , - ,- ,1,550.5 ,969.1 , 746.2
30 , - ,- ,1,860.6 ,1,162.9 , 895.4
35 , - ,- ,2,170.7 ,1,356.7 , 1,044.7
40 , - ,- ,2,480.8 ,1,550.5 , 1,193.9
45 , - ,- ,- ,1,744.3 , 1,343.1
50 , - ,- ,- ,1,938.2 , 1,492.4
55 , - ,- ,- ,2,132.0 , 1,641.6
60 , - ,- ,- ,2,325.8 ,1,790.9
65 , - ,- ,- ,2,519.6 ,1,940.1
70 , - ,- ,- ,- ,2,089.3
75 , - ,- ,- ,- ,2,238.6
80 , - ,- ,- ,- ,2,387.8
85 , - ,- ,- ,- ,2,537.0
90 , - ,- ,- ,- ,-

This looks good in the edit preview, but I don't think it will fair so well in the post . . .

swank

wow. thank you very much! i will be printing that and making flash cards, or something.

Alec

You're welcome. Its too bad the columns don't line up . . I copied from an excel spreadsheet I set up to compare the getrag, nv4500, and nv5600 with and without a US gear splitter . . .

Don't have the money for that swap yet, though . . .